Company Car Tax Calculator

Work out what a specific company car will actually cost you in Benefit-in-Kind tax — and what it costs your employer in Class 1A National Insurance — from this tax year through to 2029/30.

Your car

P11D value

List price + factory options + VAT + delivery, excluding first registration fee and road tax.

Fuel / vehicle typeElectric (0 g/km)Plug-in hybrid / low emission (1–50 g/km)PetrolDiesel (RDE2 compliant)Diesel (not RDE2, +4%)

CO₂ emissions (g/km)

Electric range (miles)

From the vehicle's registration certificate (V5C).

Tax year

Income tax rate

Scottish taxpayer? Your bands differ slightly — check gov.uk for your exact rate.

Your company car tax

£105/ month

2025/26

9% BIK rate

Your tax — annual

£1,260

Taxable benefit

£3,150

Employer Class 1A NIC

£39 /mo

Five-year projection

Same car, same list price — how the BIK rate and your cost change as scheduled rates rise to 2029/30.

Tax year	BIK rate	Taxable benefit	Your tax /mo	Employer NIC /mo
2025/26	9%	£3,150	£105	£39
2026/27	10%	£3,500	£117	£44
2027/28	11%	£3,850	£128	£48
2028/29	18%	£6,300	£210	£79
2029/30	19%	£6,650	£222	£83

2025/26

2026/27

2027/28

2028/29

2029/30

How this is worked out: taxable benefit = P11D value × BIK rate for the tax year. Your tax = taxable benefit × your income tax rate. Employer Class 1A NIC is estimated at 15% (the confirmed 2025/26 rate) applied to the same taxable benefit for every year shown, since later years' rate hasn't been announced yet. BIK bands and the diesel supplement follow published HMRC schedules for England, Wales and Northern Ireland taxpayers. This is an estimate for guidance only, not tax advice — confirm exact figures with HMRC or your tax adviser before making a decision.